Hall effect in a GdBa2Cu3O7−δ/La0.75Sr0.25MnO3 perovskite bilayer

Haberkorn, N.; Bridoux, G.; Osquiguil, E.; Nieva, G.; Guimpel, J.

doi:10.1016/j.apsusc.2007.07.041

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…The T s of the bilayers is systematically suppressed by increasing the BTO thickness, which can be associated with reduced orthorhombicity in the GBCO electrode by changes in the oxygen stoichiometry. [23][24][25]…”

Section: Introductionmentioning

confidence: 99%

Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions

Navarro

Yang

Sirena

et al. 2015

Journal of Applied Physics

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The optimization of the superconducting properties in a bottom electrode and the quality of an insulator barrier are the first steps in the development of superconductor/insulator/superconductor tunnel junctions. Here, we study the quality of a BaTiO3 tunnel barrier deposited on a 16 nm thick GdBa2Cu3O7−δ thin film by using conductive atomic force microscopy. We find that the tunnel current is systematically reduced (for equal applied voltage) by increasing the BaTiO3 barrier thickness between 1.6 and 4 nm. The BaTiO3 layers present an energy barrier of ≈1.2 eV and an attenuation length of 0.35–0.5 nm (depending on the applied voltage). The GdBa2Cu3O7−δ electrode is totally covered by a BaTiO3 thickness above 3 nm. The presence of ferroelectricity was verified by piezoresponse force microscopy for a 4 nm thick BaTiO3 top layer. The superconducting transition temperature of the bilayers is systematically suppressed by increasing the BaTiO3 thickness. This fact can be associated with stress at the interface and a reduction of the orthorhombicity of the GdBa2Cu3O7−δ. The reduction in the orthorhombicity is expected by considering the interface mismatch and it can also be affected by reduced oxygen stoichiometry (poor oxygen diffusion across the BaTiO3 barrier).

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Section: Introductionmentioning

confidence: 99%

Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions

Navarro

Yang

Sirena

et al. 2015

Journal of Applied Physics

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“…A GBCO (15 nm)/STO (3.5 nm) bilayer, with a post deposition annealing in a reduced oxygen pressure (5 Torr), was fabricated in order to test the influence of oxygen vacancies in the physical properties of the system. The superconducting transition temperature (Tc) of the electrodes, obtained from transport measurements, is 75 K. 12 A reduction of the Tc is expected probably due to an oxygen content in the samples different from the optimum value.…”

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High transition temperature superconductor/insulator bilayers for the development of ultra-fast electronics

Sirena

Avilés-Félix

Haberkorn

2013

Applied Physics Letters

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“…For REBa 2 Cu 3 O 7-x (REBCO, RE: rare-earth element) superconducting films, various buffer layers have been introduced [5][6][7][8][9][10][11][12]. Overall there are two categories, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic buffer layer is another fascinating approach, since the interaction of superconducting and magnetic orderings has long been an attractive field for potential applications of HTS systems [13][14][15][16]. Particularly, the heterostructure incorporating REBa 2 Cu 3 O 7-x and ferromagnetic lanthanum manganite (La 1-x A x MnO 3 , A: Sr and Ca) is under extensive study from fundamental to application points of view due to its excellent epitaxial compatibility and the good lattice mismatch between REBCO and manganite [9][10][11][12][15][16][17][18]. However, recent progress has noted a T c degradation in the REBCO/manganite heterostructure, due to the following competing effects between long range orderings in the superconductor (SC) and ferromagnet (FM); (i) (inverse-) proximity effect between SC and FM, which is associated with tunneling of Cooper pairs into the FM layer; (ii) the injection of spin-polarized carriers from FM to SC layer [12,15,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Strain-induced local structural change and its effect on the superconducting properties of GdBa₂Cu₃O_7-x /La_0.7Sr_0.3MnO₃ heterostructure

Song

et al. 2020

Supercond. Sci. Technol.

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The effect of ferromagnetic buffer layer on the superconducting properties of relatively thick, high temperature superconductors is investigated. Elaborately designed heterostructure films consisting of epitaxial GdBa 2 Cu 3 O 7-x (GdBCO) on top of two types of La 0.7 Sr 0.3 MnO 3 (LSMO) layer and particles, were fabricated by pulsed laser deposition. Unlike a typical superconducting/ferromagnetic system where the superconducting properties are degraded, the superconducting properties of our GdBCO/LSMO system are enhanced depending on the local structural details of the GdBCO and LSMO layers. The strain state of GdBCO characterized from the bond length of the Cu-O and the Mn-O bonds lengths is observed to vary depending on the formation of LSMO. The phase diagram of T c for the GdBCO/LSMO system established by the micro-strain of the Cu-O bond-length shows that T c reaches its maximum at the critical micro-strain. This result suggests the importance of strain state in improving the superconducting properties of thick-GdBCO/LSMO films.

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Hall effect in a GdBa2Cu3O7−δ/La0.75Sr0.25MnO3 perovskite bilayer

Cited by 6 publications

References 10 publications

Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions

Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions

High transition temperature superconductor/insulator bilayers for the development of ultra-fast electronics

Strain-induced local structural change and its effect on the superconducting properties of GdBa₂Cu₃O_7-x /La_0.7Sr_0.3MnO₃ heterostructure

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Hall effect in a GdBa2Cu3O7−δ/La0.75Sr0.25MnO3 perovskite bilayer

Cited by 6 publications

References 10 publications

Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions

Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions

High transition temperature superconductor/insulator bilayers for the development of ultra-fast electronics

Strain-induced local structural change and its effect on the superconducting properties of GdBa2Cu3O7-x /La0.7Sr0.3MnO3 heterostructure

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Strain-induced local structural change and its effect on the superconducting properties of GdBa₂Cu₃O_7-x /La_0.7Sr_0.3MnO₃ heterostructure